CVE-2021-23984

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    CVE-2021-23984

    Published: 31 Mar 2021Last Modified: 16 Apr 2026

    Summary:

    Details: A malicious extension could have opened a popup window lacking an address bar. The title of the popup lacking an address bar should not be fully controllable, but in this situation was. This could have been used to spoof a website and attempt to trick the user into providing credentials. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.

    References: https://www.mozilla.org/security/advisories/mfsa2021-10/, https://www.mozilla.org/security/advisories/mfsa2021-11/, https://www.mozilla.org/security/advisories/mfsa2021-12/, https://bugzilla.mozilla.org/show_bug.cgi?id=1693664

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-23984 | CVE-DB